Mast-arm for electric lamps



(No Model.)

J. J. SHIGKLUNA.

MAST ARM FOR ELECTRIC LAMPS.

No. 559,066. I Patented Apr. 2, 1896.

Inventor."

Attorneyd.

can be cheaply manufactured, and which can ATENT OFFICE.

JOSEPH J. SI-IICKIJUNA, OF BUFFALO, NEW YORK.

MAST-ARM FOR E LECTRIC LAMPS.

SPECIFICATION forming part of Letters Patent No. 559,066, dated April28, 1896.

Application filed April 29 To all whom it may concern.-

Be it known that LJOSEPH J. SHICKLUNA, a citizen of the United States,residing at Buffalo, in the county of Erie and State of New York, haveinvented a new and useful Improvement in Mast-Arms for Electric Lamps,of which the following is a specification.

This invention relates to the overhanging mast-arms or brackets fromwhich electric lamps are suspended.

My invention has for its objects to produce a light, strong, and durablemast-arm which be readily applied to apost and also adjusted to posts ofdifferent sizes.

In the accompanying drawings, Figurel is a side elevation of my improvedmast-arm applied to a post. Fig. 2' is a top plan view thereof. Fig. 3is a fragmentary side elevation, showing the arm swung down into itsabnormal or unlocked position. Fig. 4: is a longitudinal section, on anenlarged scale, of the yoke of the mast-arm.

Like letters of reference refer to like parts in the several figures. I

A represents a post to which the mast-arm is attached. This arm consistsof a pair of fomvardly-convergin g members B B, arranged side by sideand connected at their front ends by a head 0, consisting, preferably,of a pulley-casing. The latter is formedwith rearwardly-extendingsockets c c, which receive the front ends of the converging mem bers,the members being confined in the sockets of the pulley-casin g bysetscrews d or other suitable fastenings.

E is the front or outer guide-pu1ley of the mast-arm, which is journaledin the casing O.

The side members of the mast-arm are pro vided at their rear ends witheyes orbearings f, which receive horizontal pins or pivots g, projectingfrom diametrically opposite sides of the post. These pivots arepreferably formed on base-plates G, secured to the post by screws. Theeye of one of the side me1nbers of the mast-arm is formed on a socket F,which receives the rear end of said member, while the eye of the othermember extends rearwardly from a pulleycasing I, formed on its frontside with a socket I, which receives the rear end of the adjacentmember. The rear ends of the side members 1895. SerialNaM'MEO.(Nomoclel-l are confined in their sockets by set-screws 3' or othersuitable fastenings.

K is the inner or rearguide-pulley of the mast-arm, which is journaledin the casing I, and Z is the cord or cable which passes over saidpulley and the front guide-pulleyE and from which the electric lamp issuspendedin a well-known manner. The side members of the mast-arm areconstructed of gas pipe or tubing, and the suspension cord Z passesthrough the hollow member connected with the two pulley-casings, asshown by dotted lines in Fig. 1.

M represents a yoke or bridge which connects the side members of themast-arm at or near their middle and whereby this portion of the arm isstiffened. This yoke consists of two sections which are made lengthwiseadjustable on each other, preferably by a clamping-bolt m, secured toone section and passing through a longitudinal slot m, formed in theother section, as shown in Fig.

4. Each yoke-section is formed at its outer end with a sleeve, whichembraces the adjacent sidemember. The contiguous surfaces of theyoke-sections may be roughened or serrated and each section formed withone or more teeth, which interlock with the serrations of the othersection, as shown in Fig. 4:,

so as to reliably hold the sections against longitudinal movement oneach other. Upon loosening the clamping-bolt of the yoke-sections theside members of the mast-arm can be further spread apart or contractedto a certain extent to fit posts of different diameters, the memberspossessing sufficient elasticity to permit their being sprung to therequired extent. After engaging the eyes of the side members with thepins or pivots of the post and properly adjusting the same to the postthe clamping-bolt of the yoke is tightened.

The eyes of the side members are prefer- 10o ably locked removably upontheir pivots by the following means:

Each pivot is provided on the outer side of the adjacent eye withradially-proj ectin g lugs The inner and outer pulley-casings are ar- 5n, and the eye is provided within its bore with notches n, which arearranged to break coincident with the lugs of the pivot, so as to retainthe eye upon the pivot in the normal horizontal position of themast-arm, as shown in Fig. 1, but which register with the lugs of thepivot when the mast-arm is swung down into the position shown in Fig. 3,so as to permit the eyes to be removed from the pivots. Before applyingthe side members to the pivots or removing them therefrom theclamping-bolt of the stiffening-yoke is loosened to allow the necessaryspread of the members.

0 is a supporting wire or cable whereby the mast-arm is sustained in itshorizontal position and which extends from the head or pulley-casing Oto a yoke 19, which embraces the post above the mast-arm. The pivotalconnection of the mast-arm with the post permits the arm to be adjustedvertically by shortening or lengthening its sustaining-cable o forraising the arm to the desired height and for bringing the lamp over themiddle of a street.

My improved mast-arm can be constructed at comparatively small cost, asordinary gaspipe may be utilized for its side members and the remainingparts can be cast. Upon loosening the set-screws of the several socketsthe parts of the mast-arm can be separated and compactly shipped. Theseset-screws preferably enter openings in the gas-pipe, as shown in Fig.2, so as to reliably retain the same in the sockets.

I claim as my invention 1. A mast-arm for electric lamps consisting of apair of converging sidemembers, an outer pulley-casing provided 011 itsrear side with rearwardly-diverging sockets which receive the front endsof said side members, an inner pulley-casing arranged at the rear end ofthe side member which is in line with the outer pulley-casing, andprovided on its front side with a socket which receives the rear end ofsaid side member and on its rear side with a bearing-eye, and a socketsecured to the rear end of the other side member and provided on itsrear side with a bearing-eye, said bear-' ing-eyes being adapted toreceive journals arranged on opposite sides of the post to which themast-arm is attached, substantially as set forth.

2. A mast-arm for electric lamps consisting of a pair of converging sidemembers, a head or casing connecting the outer ends of said members,eyes or bearings arranged at the rear ends of said members, and a yokeor bridge connecting the side members between said head or casing andsaid eyes or bearings and composed of sections made lengthwiseadjustable on each other, substantially as set forth.

3. A mast-arm for electric lamps, consisting of a pair of convergingside members, a head or casing connecting the outer ends of saidmembers, eyes or bearings arranged at the rear ends of said members, anda yoke or bridge connecting the side members between said head or casingand said eyes or bearings and composed of adjustable sections, one ofwhich is provided with a longitudinal slot and the other with aclamping-bolt passing through said slot, substantially as set forth.

\Vitness my hand this 15th day of April, 1895.

J OSEPII J. SI'IICKLUNA.

\Vitnesses:

CARL F. Gnvnn, ELLA R. DEAN.

